Adolf Naef (May 1, 1883-May 11, 1949) was a Swiss zoologist and palaeontologist, famous for his work on Cephalopoda. May 1 is the 121st day of the year in the Gregorian calendar (122nd in leap years). ... 1883 (MDCCCLXXXIII) was a common year starting on Monday (see link for calendar). ... May 11 is the 131st day of the year in the Gregorian Calendar (132nd in leap years). ... Year 1949 (MCMXLIX) was a common year starting on Saturday (the link is to a full 1949 calendar). ... Zoology (Greek zoon = animal and logos = word) is the biological discipline which involves the study of animals. ... A paleontologist carefully chips rock from a column of dinosaur vertebrae. ... Orders Sepiida Sepiolida Spirulida Teuthida Octopoda Vampyromorphida Nautilida The Cephalopods (head-foot) are the mollusc class Cephalopoda characterized by bilateral body symmetry, a prominent head, and a modification of the mollusc foot into the form of arms or tentacles. ...